Sidewalk Issues

How come it always seems, when I'm walking on the sidewalk or driving on the highway, the people behind me are always in such a rush, but the people in front of me have so much patience? If they were just in opposite positions, we'd all be a lot happier. I wonder about these people that are, as my mother used to say, 'slow as molasses.' Did you ever notice they are always in front of you on the highway? If they're so friggin' slow, how did they get ahead of you in the first place? And the leadfooted speed-demons that Mom used to call 'wackos' -- if they're so fast, then why are they always so far behind? If everyone would just travel at MY speed, we'd all get where we were going efficiently. Seriously, people.